[ubuntu] Fresh install

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http://ubuntuforums.org – Have a laptop with new hard drive. Do I have to install Windows before installing ubuntu? I attemped boot from CD where I copied the .iso file and attempted same form usb drive. Set to system to boot to these, but does nothing. I just want to use only ubuntu - no windows. Is this even possible. Everything on the web seems so simple on a windows machine. (Hardware)